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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

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<body>
    <h1>问卷</h1>
    <h3>选择专业</h3>
    <select name="" id="">
        <option value="">软本</option>
        <option value=""selected="selected">忘本</option>
        <option value="">计算机</option>
        <option value="">大数据</option>
        <option value="">信本</option>
    </select><br>
    <h3>请选择你喜欢的小吃</h3>
    <!-- select>optgroup>option 注意回车地方-->
    <select name="" multiple="multiple" size="3">
        <optgroup label="四川">
            <option value="">酸辣粉</option>
            <option value="">夫妻肺片</option>
        </optgroup>
        <optgroup label="北京">
            <option value="">杂酱面</option>
            <option value="">烤鸭</option>
            <!-- 按住ctrl多选 -->
        </optgroup>
    </select>
</body>
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